Wild salmon spend most of their lives in the ocean but return to freshwater rivers to spawn, or reproduce. most wild salmon will only spawn in specific spawning grounds in the rivers in which they were born. the construction of hydroelectric dams in rivers has blocked the paths of some salmon returning to their spawning grounds. this has led to population declines. which method would be most effective in preventing further wild salmon population declines caused by the construction of hydroelectric dams? a. constructing passageways next to dams to allow salmon to swim around blocked rivers b. establishing protected regions around wild salmon spawning grounds in specific rivers c. observing the migration patterns of wild salmon by tagging and tracking a small sample of fish d. monitoring genetic diversity by using netting to catch salmon and obtain genetic samples

A

Constructing passage ways near the dams to allow to salmon to swim around blocked rivers.

The construction of dams in rivers has blocked the path of  some salmons returning to spawning grounds. The best way to overcome this is to make the passage ways near the dams to allow salmons to swim in areas which have blocked due to dams. So that salmons can returned to the spawning ground and can spawn which leads to increase in their population.

Answer and Explanation:

A

Constructing passage ways near the dams to allow to salmon to swim around blocked rivers.

The development of dams in streams has hindered the way of certain salmons getting back to bringing forth grounds. The most ideal approach to defeat this is to make the entry ways close to the dams to permit salmons to swim in regions which have impeded because of dams. So salmons can got back to the producing ground and can generate which prompts increment in their populace.

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